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Condensed consolidating financial information - Condensed consolidated statement of cash flows (Details) - USD ($) $ in Millions	3 Months Ended
	May 05, 2018	Apr. 29, 2017
Cash flows from operating activities
Net cash provided by (used in) operating activities	$ 27.9	$ 56.8
Investing activities
Purchase of property, plant and equipment	(26.1)	(56.2)
Investment in subsidiaries		0.0
Purchase of available-for-sale securities	(0.4)	(0.7)
Proceeds from available-for-sale securities	1.1	0.3
Net cash used in investing activities	(25.4)	(56.6)
Financing activities
Dividends paid on common shares	(18.8)	(17.8)
Dividends paid on redeemable convertible preferred shares	(7.8)	(11.3)
Intra-entity dividends paid	0.0
Repurchase of common shares	(60.0)	0.0
Proceeds from long-term debt		666.5
Proceeds from revolving credit facility	40.0	128.0
Repayments of revolving credit facility		(121.0)
Repayments of bank overdrafts	(13.9)	31.2
Other financing activities	(2.1)	(1.0)
Intra-entity activity, net	0.0	0.0
Net cash (used in) provided by financing activities	(69.3)	3.6
Cash and cash equivalents at beginning of period	225.1	98.7
Decrease in cash and cash equivalents	(66.8)	3.8
Effect of exchange rate changes on cash and cash equivalents	(4.4)	(2.8)
Cash and cash equivalents at end of period	153.9	99.7
Consolidation, Eliminations
Cash flows from operating activities
Net cash provided by (used in) operating activities	(63.6)
Investing activities
Purchase of property, plant and equipment	0.0	0.0
Purchase of available-for-sale securities	0.0	0.0
Proceeds from available-for-sale securities	0.0	0.0
Net cash used in investing activities	0.0	0.0
Financing activities
Dividends paid on common shares	0.0	0.0
Dividends paid on redeemable convertible preferred shares	0.0	0.0
Intra-entity dividends paid	63.6
Repurchase of common shares	0.0
Proceeds from long-term debt		0.0
Proceeds from revolving credit facility	0.0	0.0
Repayments of revolving credit facility		0.0
Repayments of bank overdrafts	0.0
Other financing activities	0.0	0.0
Intra-entity activity, net	0.0	0.0
Net cash (used in) provided by financing activities	63.6	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Decrease in cash and cash equivalents	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Cash and cash equivalents at end of period	0.0	0.0
Guarantor Subsidiaries | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	(68.0)	(20.9)
Investing activities
Purchase of property, plant and equipment	(25.9)	(56.2)
Purchase of available-for-sale securities	0.0	0.0
Proceeds from available-for-sale securities	0.0	0.0
Net cash used in investing activities	(25.9)	(56.2)
Financing activities
Dividends paid on common shares	0.0	0.0
Dividends paid on redeemable convertible preferred shares	0.0	0.0
Intra-entity dividends paid	0.0
Repurchase of common shares	0.0
Proceeds from long-term debt		0.0
Proceeds from revolving credit facility	40.0	128.0
Repayments of revolving credit facility		(121.0)
Repayments of bank overdrafts	(13.9)	31.2
Other financing activities	0.0	0.0
Intra-entity activity, net	30.8	48.9
Net cash (used in) provided by financing activities	50.2	82.6
Cash and cash equivalents at beginning of period	150.5	70.3
Decrease in cash and cash equivalents	(43.7)	5.5
Effect of exchange rate changes on cash and cash equivalents	(4.3)	(2.9)
Cash and cash equivalents at end of period	102.5	72.9
Non-Guarantor Subsidiaries | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	93.4	72.8
Investing activities
Purchase of property, plant and equipment	(0.2)
Purchase of available-for-sale securities	(0.4)	(0.7)
Proceeds from available-for-sale securities	1.1	0.3
Net cash used in investing activities	0.5	(0.4)
Financing activities
Dividends paid on common shares	0.0	0.0
Dividends paid on redeemable convertible preferred shares	0.0	0.0
Intra-entity dividends paid	(63.6)
Repurchase of common shares	0.0
Proceeds from long-term debt		666.5
Proceeds from revolving credit facility	0.0	0.0
Repayments of revolving credit facility		0.0
Repayments of bank overdrafts	0.0
Other financing activities	0.0	0.0
Intra-entity activity, net	(53.0)	(73.4)
Net cash (used in) provided by financing activities	(116.6)	(73.4)
Cash and cash equivalents at beginning of period	72.8	26.6
Decrease in cash and cash equivalents	(22.7)	(1.0)
Effect of exchange rate changes on cash and cash equivalents	(0.1)	0.1
Cash and cash equivalents at end of period	50.0	25.7
Signet Jewelers Limited | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	61.2
Investing activities
Purchase of property, plant and equipment	0.0	0.0
Investment in subsidiaries		0.0
Purchase of available-for-sale securities	0.0	0.0
Proceeds from available-for-sale securities	0.0	0.0
Net cash used in investing activities	0.0	0.0
Financing activities
Dividends paid on common shares	(18.8)	(17.8)
Dividends paid on redeemable convertible preferred shares	(7.8)	(11.3)
Intra-entity dividends paid	0.0
Repurchase of common shares	(60.0)
Proceeds from long-term debt		0.0
Proceeds from revolving credit facility	0.0	0.0
Repayments of bank overdrafts	0.0
Other financing activities	(2.1)	(1.0)
Intra-entity activity, net	27.1	29.4
Net cash (used in) provided by financing activities	(61.6)	(0.7)
Cash and cash equivalents at beginning of period	1.7	1.7
Decrease in cash and cash equivalents	(0.4)	(0.7)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Cash and cash equivalents at end of period	1.3	1.0
Signet UK Finance plc | Reportable Legal Entities
Cash flows from operating activities
Net cash provided by (used in) operating activities	4.9	4.9
Investing activities
Purchase of property, plant and equipment	0.0	0.0
Investment in subsidiaries		0.0
Purchase of available-for-sale securities	0.0	0.0
Proceeds from available-for-sale securities	0.0	0.0
Net cash used in investing activities	0.0	0.0
Financing activities
Dividends paid on common shares	0.0	0.0
Dividends paid on redeemable convertible preferred shares	0.0	0.0
Intra-entity dividends paid	0.0
Repurchase of common shares	0.0
Proceeds from long-term debt		0.0
Proceeds from revolving credit facility	0.0	0.0
Repayments of revolving credit facility		0.0
Repayments of bank overdrafts	0.0	0.0
Other financing activities	0.0	0.0
Intra-entity activity, net	(4.9)	(4.9)
Net cash (used in) provided by financing activities	(4.9)	(4.9)
Cash and cash equivalents at beginning of period	0.1	0.1
Decrease in cash and cash equivalents	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
Cash and cash equivalents at end of period	0.1	0.1
Term Loan
Financing activities
Repayments of debt	(6.7)	(4.5)
Term Loan | Consolidation, Eliminations
Financing activities
Repayments of debt	0.0	0.0
Term Loan | Guarantor Subsidiaries | Reportable Legal Entities
Financing activities
Repayments of debt	(6.7)	(4.5)
Term Loan | Non-Guarantor Subsidiaries | Reportable Legal Entities
Financing activities
Repayments of debt	0.0
Term Loan | Signet Jewelers Limited | Reportable Legal Entities
Financing activities
Repayments of debt	0.0	0.0
Term Loan | Signet UK Finance plc | Reportable Legal Entities
Financing activities
Repayments of debt	0.0	0.0
Securitization facility
Financing activities
Repayments of debt	$ 0.0	(666.5)
Securitization facility | Consolidation, Eliminations
Financing activities
Repayments of debt		0.0
Securitization facility | Guarantor Subsidiaries | Reportable Legal Entities
Financing activities
Repayments of debt		0.0
Securitization facility | Non-Guarantor Subsidiaries | Reportable Legal Entities
Financing activities
Repayments of debt		(666.5)
Securitization facility | Signet Jewelers Limited | Reportable Legal Entities
Financing activities
Repayments of debt		0.0
Securitization facility | Signet UK Finance plc | Reportable Legal Entities
Financing activities
Repayments of debt		$ 0.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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